About Protect PDF
Add password protection to secure your PDF documents
Encrypt your PDF files with industry-standard AES encryption. Set a password to prevent unauthorized access. All processing happens locally in your browser — your files never leave your device.
How to Password Protect PDF
1Upload Your PDF
Select the PDF file you want to protect. Drag and drop or click to browse.
2Set Strong Password
Create a strong password (min. 6 characters). Confirm by entering it twice.
3Encrypt PDF
Click "Protect PDF Now" to apply AES encryption. Processing is instant.
4Download Protected PDF
Download your password-protected PDF. Remember your password—it cannot be recovered!
Technical Capabilities
- AES Encryption Standard: Implements Advanced Encryption Standard (AES) with 128-bit or 256-bit key lengths. Industry-standard encryption used by governments and financial institutions worldwide.
- Password Strength Validation: Enforces minimum 6-character password length with confirmation field to prevent typos. Recommends strong passwords combining uppercase, lowercase, numbers, and symbols.
- Universal PDF Compatibility: Protected PDFs open in Adobe Acrobat, browsers, mobile apps, and third-party viewers. Cross-platform encryption ensures consistent security on all devices.
- Client-Side Processing: PDF encryption occurs entirely in browser using pdf-lib and cryptography libraries. No file uploads—complete privacy and zero data retention.
- Original Document Preservation: Encryption preserves all original PDF content—text, images, forms, annotations, metadata. Only access control changes, not content integrity.
Professional Use Cases
Confidential Business Documents
Protect financial statements, strategic plans, and board presentations before email distribution. Ensures only authorized recipients access sensitive business intelligence.
Legal Contracts and Agreements
Secure client contracts, NDAs, and settlement agreements during review. Prevents unauthorized disclosure and maintains attorney-client privilege.
Healthcare Patient Records
Comply with HIPAA regulations by password-protecting patient medical records, test results, and insurance documents shared via email or patient portals.
Personal Financial Documents
Secure tax returns, bank statements, and loan applications when sharing with accountants, advisors, or lenders via email.